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Day Length for Various Latitudes

The following tables provide year-round hours of daylight at 5 degree intervals from 60°N to 60°S latitude for every 15 day period.

Shing Lam compiled the C code based on a formula published in:
Meeus, Jean. (1991) Astronomical algorithms. Richmond, Va.: Willmann-Bell. ISBN 0943396352

We reorganized the data into these tables.


Choose a Latitude:

Note- Please allow ENTIRE page to load before choosing a latitude.

60°N

55°N

50°N

45°N

40°N

35°N

30°N

25°N

20°N

15°N

10°N

5°N

Equator 0°

5°S

10°S

15°S

20°S

25°S

30°S

35°S

40°S

45°S

50°S

55°S

60°S

Latitude 60°S

Date

Jan 1

Jan 16

Feb 1

Feb 16

Mar 1

Mar 16

Hours light

18.34

17.65

16.49

15.22

14.04

12.65

Date

Apr 1

Apr 16

May 1

May 16

Jun 1

Jun 16

Hours light

11.16

9.78

8.43

7.19

6.12

5.57

Date

Jul 1

Jul 16

Aug 1

Aug 16

Sep 1

Sep 16

Hours light

5.62

6.26

7.38

8.64

10.09

11.48

Date

Oct 1

Oct 16

Nov 1

Nov 16

Dec 1

Dec 16

Hours light

12.87

14.26

15.69

16.91

17.90

18.44

Choose Latitude

Latitude 55°S

Date

Jan 1

Jan 16

Feb 1

Feb 16

Mar 1

Mar 16

Hours light

17.00

16.50

15.63

14.63

13.68

12.54

Date

Apr 1

Apr 16

May 1

May 16

Jun 1

Jun 16

Hours light

11.31

10.18

9.09

8.13

7.33

6.94

Date

Jul 1

Jul 16

Aug 1

Aug 16

Sep 1

Sep 16

Hours light

6.97

7.43

8.27

9.26

10.43

11.57

Date

Oct 1

Oct 16

Nov 1

Nov 16

Dec 1

Dec 16

Hours light

12.72

13.85

15.00

15.95

16.68

17.07

Choose Latitude

Latitude 50°S

Date

Jan 1

Jan 16

Feb 1

Feb 16

Mar 1

Mar 16

Hours light

16.07

15.68

14.99

14.18

13.39

12.45

Date

Apr 1

Apr 16

May 1

May 16

Jun 1

Jun 16

Hours light

11.42

10.48

9.59

8.81

8.19

7.88

Date

Jul 1

Jul 16

Aug 1

Aug 16

Sep 1

Sep 16

Hours light

7.91

8.26

8.93

9.73

10.69

11.64

Date

Oct 1

Oct 16

Nov 1

Nov 16

Dec 1

Dec 16

Hours light

12.60

13.54

14.48

15.25

15.82

16.12

Choose Latitude

Latitude 45°S

Date

Jan 1

Jan 16

Feb 1

Feb 16

Mar 1

Mar 16

Hours light

15.36

15.05

14.49

13.82

13.17

12.38

Date

Apr 1

Apr 16

May 1

May 16

Jun 1

Jun 16

Hours light

11.52

10.73

9.99

9.35

8.84

8.60

Date

Jul 1

Jul 16

Aug 1

Aug 16

Sep 1

Sep 16

Hours light

8.62

8.90

9.44

10.10

10.90

11.70

Date

Oct 1

Oct 16

Nov 1

Nov 16

Dec 1

Dec 16

Hours light

12.50

13.29

14.07

14.70

15.17

15.40

Choose Latitude

Latitude 40°S

Date

Jan 1

Jan 16

Feb 1

Feb 16

Mar 1

Mar 16

Hours light

14.79

14.54

14.08

13.52

12.98

12.32

Date

Apr 1

Apr 16

May 1

May 16

Jun 1

Jun 16

Hours light

11.59

10.93

10.32

9.79

9.37

9.18

Date

Jul 1

Jul 16

Aug 1

Aug 16

Sep 1

Sep 16

Hours light

9.19

9.42

9.87

10.41

11.08

11.75

Date

Oct 1

Oct 16

Nov 1

Nov 16

Dec 1

Dec 16

Hours light

12.42

13.08

13.73

14.25

14.63

14.83

Choose Latitude

Latitude 35°S

Date

Jan 1

Jan 16

Feb 1

Feb 16

Mar 1

Mar 16

Hours light

14.31

14.11

13.73

13.27

12.82

12.26

Date

Apr 1

Apr 16

May 1

May 16

Jun 1

Jun 16

Hours light

11.66

11.11

10.60

10.16

9.82

9.66

Date

Jul 1

Jul 16

Aug 1

Aug 16

Sep 1

Sep 16

Hours light

9.67

9.86

10.23

10.68

11.23

11.79

Date

Oct 1

Oct 16

Nov 1

Nov 16

Dec 1

Dec 16

Hours light

12.35

12.90

13.44

13.87

14.18

14.34

Choose Latitude

Latitude 30°S

Date

Jan 1

Jan 16

Feb 1

Feb 16

Mar 1

Mar 16

Hours light

13.90

13.73

13.42

13.04

12.67

12.22

Date

Apr 1

Apr 16

May 1

May 16

Jun 1

Jun 16

Hours light

11.72

11.27

10.85

10.49

10.21

10.08

Date

Jul 1

Jul 16

Aug 1

Aug 16

Sep 1

Sep 16

Hours light

10.09

10.25

10.54

10.91

11.37

11.83

Date

Oct 1

Oct 16

Nov 1

Nov 16

Dec 1

Dec 16

Hours light

12.29

12.74

13.19

13.54

13.79

13.92

Choose Latitude

Latitude 25°S

Date

Jan 1

Jan 16

Feb 1

Feb 16

Mar 1

Mar 16

Hours light

13.53

13.39

13.15

12.84

12.54

12.18

Date

Apr 1

Apr 16

May 1

May 16

Jun 1

Jun 16

Hours light

11.77

11.41

11.07

10.78

10.56

10.46

Date

Jul 1

Jul 16

Aug 1

Aug 16

Sep 1

Sep 16

Hours light

10.46

10.59

10.83

11.12

11.49

11.86

Date

Oct 1

Oct 16

Nov 1

Nov 16

Dec 1

Dec 16

Hours light

12.23

12.60

12.96

13.24

13.44

13.55

Choose Latitude

Latitude 20°S

Date

Jan 1

Jan 16

Feb 1

Feb 16

Mar 1

Mar 16

Hours light

13.19

13.09

12.89

12.66

12.42

12.14

Date

Apr 1

Apr 16

May 1

May 16

Jun 1

Jun 16

Hours light

11.82

11.54

11.28

11.05

10.88

10.80

Date

Jul 1

Jul 16

Aug 1

Aug 16

Sep 1

Sep 16

Hours light

10.80

10.90

11.08

11.32

11.60

11.89

Date

Oct 1

Oct 16

Nov 1

Nov 16

Dec 1

Dec 16

Hours light

12.18

12.47

12.75

12.97

13.12

13.20

Choose Latitude

Latitude 15°S

Date

Jan 1

Jan 16

Feb 1

Feb 16

Mar 1

Mar 16

Hours light

12.87

12.80

12.66

12.48

12.31

12.10

Date

Apr 1

Apr 16

May 1

May 16

Jun 1

Jun 16

Hours light

11.87

11.66

11.47

11.30

11.18

11.12

Date

Jul 1

Jul 16

Aug 1

Aug 16

Sep 1

Sep 16

Hours light

11.12

11.19

11.33

11.50

11.71

11.92

Date

Oct 1

Oct 16

Nov 1

Nov 16

Dec 1

Dec 16

Hours light

12.13

12.34

12.55

12.71

12.83

12.88

Choose Latitude

Latitude 10°S

Date

Jan 1

Jan 16

Feb 1

Feb 16

Mar 1

Mar 16

Hours light

12.57

12.52

12.43

12.32

12.21

12.07

Date

Apr 1

Apr 16

May 1

May 16

Jun 1

Jun 16

Hours light

11.91

11.78

11.65

11.54

11.46

11.42

Date

Jul 1

Jul 16

Aug 1

Aug 16

Sep 1

Sep 16

Hours light

11.42

11.47

11.56

11.67

11.81

11.95

Date

Oct 1

Oct 16

Nov 1

Nov 16

Dec 1

Dec 16

Hours light

12.09

12.23

12.36

12.47

12.54

12.58

Choose Latitude

Latitude 5°S

Date

Jan 1

Jan 16

Feb 1

Feb 16

Mar 1

Mar 16

Hours light

12.28

12.26

12.21

12.16

12.10

12.03

Date

Apr 1

Apr 16

May 1

May 16

Jun 1

Jun 16

Hours light

11.96

11.89

11.83

11.77

11.73

11.71

Date

Jul 1

Jul 16

Aug 1

Aug 16

Sep 1

Sep 16

Hours light

11.71

11.74

11.78

11.84

11.90

11.97

Date

Oct 1

Oct 16

Nov 1

Nov 16

Dec 1

Dec 16

Hours light

12.04

12.11

12.18

12.23

12.27

12.29

Choose Latitude

Latitude 0°

Date

Jan 1

Jan 16

Feb 1

Feb 16

Mar 1

Mar 16

Hours light

12.00

12.00

12.00

12.00

12.00

12.00

Date

Apr 1

Apr 16

May 1

May 16

Jun 1

Jun 16

Hours light

12.00

12.00

12.00

12.00

12.00

12.00

Date

Jul 1

Jul 16

Aug 1

Aug 16

Sep 1

Sep 16

Hours light

12.00

12.00

12.00

12.00

12.00

12.00

Date

Oct 1

Oct 16

Nov 1

Nov 16

Dec 1

Dec 16

Hours light

12.00

12.00

12.00

12.00

12.00

12.00

Choose Latitude

Latitude 5°N

Date

Jan 1

Jan 16

Feb 1

Feb 16

Mar 1

Mar 16

Hours light

11.72

11.74

11.79

11.84

11.90

11.97

Date

Apr 1

Apr 16

May 1

May 16

Jun 1

Jun 16

Hours light

12.04

12.11

12.17

12.23

12.27

12.29

Date

Jul 1

Jul 16

Aug 1

Aug 16

Sep 1

Sep 16

Hours light

12.29

12.26

12.22

12.16

12.10

12.03

Date

Oct 1

Oct 16

Nov 1

Nov 16

Dec 1

Dec 16

Hours light

11.96

11.89

11.82

11.77

11.73

11.71

Choose Latitude

Latitude 10°N

Date

Jan 1

Jan 16

Feb 1

Feb 16

Mar 1

Mar 16

Hours light

11.43

11.48

11.57

11.68

11.79

11.93

Date

Apr 1

Apr 16

May 1

May 16

Jun 1

Jun 16

Hours light

12.09

12.22

12.35

12.46

12.54

12.58

Date

Jul 1

Jul 16

Aug 1

Aug 16

Sep 1

Sep 16

Hours light

12.58

12.53

12.44

12.33

12.19

12.05

Date

Oct 1

Oct 16

Nov 1

Nov 16

Dec 1

Dec 16

Hours light

11.91

11.77

11.64

11.53

11.46

11.42

Choose Latitude

Latitude 15°N

Date

Jan 1

Jan 16

Feb 1

Feb 16

Mar 1

Mar 16

Hours light

11.13

11.20

11.34

11.52

11.69

11.90

Date

Apr 1

Apr 16

May 1

May 16

Jun 1

Jun 16

Hours light

12.13

12.34

12.53

12.70

12.82

12.88

Date

Jul 1

Jul 16

Aug 1

Aug 16

Sep 1

Sep 16

Hours light

12.88

12.81

12.67

12.50

12.29

12.08

Date

Oct 1

Oct 16

Nov 1

Nov 16

Dec 1

Dec 16

Hours light

11.87

11.66

11.45

11.29

11.17

11.12

Choose Latitude

Latitude 20°N

Date

Jan 1

Jan 16

Feb 1

Feb 16

Mar 1

Mar 16

Hours light

10.81

10.91

11.11

11.34

11.58

11.86

Date

Apr 1

Apr 16

May 1

May 16

Jun 1

Jun 16

Hours light

12.18

12.46

12.72

12.95

13.12

13.20

Date

Jul 1

Jul 16

Aug 1

Aug 16

Sep 1

Sep 16

Hours light

13.20

13.10

12.92

12.68

12.40

12.11

Date

Oct 1

Oct 16

Nov 1

Nov 16

Dec 1

Dec 16

Hours light

11.82

11.53

11.25

11.03

10.88

10.80

Choose Latitude

Latitude 25°N

Date

Jan 1

Jan 16

Feb 1

Feb 16

Mar 1

Mar 16

Hours light

10.47

10.61

10.85

11.16

11.46

11.82

Date

Apr 1

Apr 16

May 1

May 16

Jun 1

Jun 16

Hours light

12.23

12.59

12.93

13.22

13.44

13.54

Date

Jul 1

Jul 16

Aug 1

Aug 16

Sep 1

Sep 16

Hours light

13.54

13.41

13.17

12.88

12.51

12.14

Date

Oct 1

Oct 16

Nov 1

Nov 16

Dec 1

Dec 16

Hours light

11.77

11.40

11.04

10.76

10.56

10.45

Choose Latitude

Latitude 30°N

Date

Jan 1

Jan 16

Feb 1

Feb 16

Mar 1

Mar 16

Hours light

10.10

10.27

10.58

10.96

11.33

11.78

Date

Apr 1

Apr 16

May 1

May 16

Jun 1

Jun 16

Hours light

12.28

12.73

13.15

13.51

13.79

13.92

Date

Jul 1

Jul 16

Aug 1

Aug 16

Sep 1

Sep 16

Hours light

13.91

13.75

13.46

13.09

12.63

12.17

Date

Oct 1

Oct 16

Nov 1

Nov 16

Dec 1

Dec 16

Hours light

11.71

11.26

10.81

10.46

10.21

10.08

Choose Latitude

Latitude 35°N

Date

Jan 1

Jan 16

Feb 1

Feb 16

Mar 1

Mar 16

Hours light

9.69

9.89

10.27

10.73

11.18

11.74

Date

Apr 1

Apr 16

May 1

May 16

Jun 1

Jun 16

Hours light

12.34

12.89

13.40

13.84

14.18

14.34

Date

Jul 1

Jul 16

Aug 1

Aug 16

Sep 1

Sep 16

Hours light

14.33

14.14

13.77

13.32

12.77

12.21

Date

Oct 1

Oct 16

Nov 1

Nov 16

Dec 1

Dec 16

Hours light

11.65

11.10

10.56

10.13

9.82

9.66

Choose Latitude

Latitude 40°N

Date

Jan 1

Jan 16

Feb 1

Feb 16

Mar 1

Mar 16

Hours light

9.21

9.46

9.92

10.48

11.02

11.68

Date

Apr 1

Apr 16

May 1

May 16

Jun 1

Jun 16

Hours light

12.41

13.07

13.68

14.21

14.63

14.82

Date

Jul 1

Jul 16

Aug 1

Aug 16

Sep 1

Sep 16

Hours light

14.81

14.58

14.13

13.59

12.92

12.25

Date

Oct 1

Oct 16

Nov 1

Nov 16

Dec 1

Dec 16

Hours light

11.58

10.92

10.27

9.75

9.37

9.17

Choose Latitude

Latitude 45°N

Date

Jan 1

Jan 16

Feb 1

Feb 16

Mar 1

Mar 16

Hours light

8.64

8.95

9.51

10.18

10.83

11.62

Date

Apr 1

Apr 16

May 1

May 16

Jun 1

Jun 16

Hours light

12.48

13.27

14.01

14.65

15.16

15.40

Date

Jul 1

Jul 16

Aug 1

Aug 16

Sep 1

Sep 16

Hours light

15.38

15.10

14.56

13.90

13.10

12.30

Date

Oct 1

Oct 16

Nov 1

Nov 16

Dec 1

Dec 16

Hours light

11.50

10.71

9.93

9.30

8.83

8.60

Choose Latitude

Latitude 50°N

Date

Jan 1

Jan 16

Feb 1

Feb 16

Mar 1

Mar 16

Hours light

7.93

8.32

9.01

9.82

10.61

11.55

Date

Apr 1

Apr 16

May 1

May 16

Jun 1

Jun 16

Hours light

12.58

13.52

14.41

15.19

15.81

16.12

Date

Jul 1

Jul 16

Aug 1

Aug 16

Sep 1

Sep 16

Hours light

16.09

15.74

15.07

14.27

13.31

12.36

Date

Oct 1

Oct 16

Nov 1

Nov 16

Dec 1

Dec 16

Hours light

11.40

10.46

9.52

8.75

8.18

7.88

Choose Latitude

Latitude 55°N

Date

Jan 1

Jan 16

Feb 1

Feb 16

Mar 1

Mar 16

Hours light

7.00

7.50

8.37

9.37

10.32

11.46

Date

Apr 1

Apr 16

May 1

May 16

Jun 1

Jun 16

Hours light

12.69

13.82

14.91

15.87

16.67

17.06

Date

Jul 1

Jul 16

Aug 1

Aug 16

Sep 1

Sep 16

Hours light

17.03

16.57

15.73

14.74

13.57

12.43

Date

Oct 1

Oct 16

Nov 1

Nov 16

Dec 1

Dec 16

Hours light

11.28

10.15

9.00

8.05

7.32

6.93

Choose Latitude

Latitude 60°N

Date

Jan 1

Jan 16

Feb 1

Feb 16

Mar 1

Mar 16

Hours light

5.66

6.35

7.51

8.78

9.96

11.35

Date

Apr 1

Apr 16

May 1

May 16

Jun 1

Jun 16

Hours light

12.84

14.22

15.57

16.81

17.88

18.43

Date

Jul 1

Jul 16

Aug 1

Aug 16

Sep 1

Sep 16

Hours light

18.38

17.74

16.62

15.36

13.91

12.52

Date

Oct 1

Oct 16

Nov 1

Nov 16

Dec 1

Dec 16

Hours light

11.13

9.74

8.31

7.09

6.10

5.56

Choose Latitude


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